Prepending the locations to @INC wouldn't help, as the RTB folks wouldn't be able to load the old version anymore. When searching for a module, Perl checks the version only when it finds the first implementation. If the version is less than the one specified, Perl dies, it doesn't look for a different version in the rest of the paths.

$ cat My.pm
package My; our $VERSION = "1";
warn "1 loaded";
1;

$ cat 0/My.pm
package My; our $VERSION = "2";
warn "2 loaded";
1;

$ perl -I. -I0 -e 'use My 1; warn $My::VERSION;'
1 loaded at My.pm line 2.
1 at -e line 1.
$ perl -I0 -I. -e 'use My 1; warn $My::VERSION;'
2 loaded at 0/My.pm line 2.
2 at -e line 1.
$ perl -I. -I0 -e 'use My 2; warn $My::VERSION;'
1 loaded at My.pm line 2.
My version 2 required--this is only version 1 at -e line 1.
BEGIN failed--compilation aborted at -e line 1.
$?=255
$ perl -I0 -I. -e 'use My 2; warn $My::VERSION;'
2 loaded at 0/My.pm line 2.
2 at -e line 1.
$ perl -I0 -I. -e 'use My 1; warn $My::VERSION;'
2 loaded at 0/My.pm line 2.
2 at -e line 1.
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But, interestingly

$ perl -I. -I0 -e 'eval q{use My 2}; warn $My::VERSION;'
1 loaded at My.pm line 2.
1 at -e line 1.
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($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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